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The ttyS[0-3] devices are weird. They may be enumerated, but when one
actually tries to open and use them they return EIO, because they don't
actually exist. Because they may be enumerated they may be specified on
the kernel command line as console=. And some people do that as default.
As response to that we'll spawn a getty on the tty that will quickly
fail, and we retry a couple of time before giving up. That is quite
noisy.
With this new change we will validate all serial terminals configured
with console= on the kernel cmdline before adding gettys on them, and
remove the invalid ones. THis should remove the noise later on.
This should make Eric Paris happy!
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Ensure to start getty programs on all essential system consoles on Linux on
System z. Add these essential devices to the list of virtualization_consoles
to always generate getty configurations.
For the sake of completion, the list of essential consoles is:
/dev/sclp_line0 - Operating system messages applet (LPAR)
/dev/ttysclp0 - Integrated ASCII console applet (z/VM and LPAR)
/dev/ttyS0 - Already handled by systemd (3215 console on z/VM)
/dev/hvc0 - Already handled by systemd (IUCV HVC terminal on z/VM)
Depending on the environment, z/VM or LPAR, only a subset of these terminals
are available.
See also RH BZ 860158[1] "Cannot login via Operating System Console into RHEL7
instance installed on a LPAR". This bugzilla actually blocks the installation
of Linux on System z instances in LPAR mode.
[1] https://bugzilla.redhat.com/show_bug.cgi?id=860158
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PID 1 and start gettys on all ttys listed therein
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This enables a getty on active kernel consoles even when they are not
the last one specified on the kernel command line and mapped to
/dev/console. Now the order "console=ttyS0 console=tty0" works in
addition to "console=tty0 console=ttyS0".
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It's polite to print the name of the link that wasn't created,
and it makes little sense to print the target.
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Also split out some fileio functions to fileio.c and provide a SELinux
aware pendant in fileio-label.c
see https://bugzilla.redhat.com/show_bug.cgi?id=881577
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If the system does not have any active console, we should not try to
create an empty symlink. Instead, create no symlink at all.
Otherwise, on systems with CONFIG_VT=n and no serial console, we will
create a symlink with an empty template parameter.
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also a number of minor fixups and bug fixes: spelling, oom errors
that didn't print errors, not properly forwarding error codes,
few more consistency issues, et cetera
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glibc/glib both use "out of memory" consistantly so maybe we should
consider that instead of this.
Eliminates one string out of a number of binaries. Also fixes extra newline
in udev/scsi_id
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This is to match strappend() and the other string related functions.
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context
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Previously generated units were always placed at the end of the search
path. With this change there will be three unit dirs instead of one, to
place generated entries at the beginning, in the middle and at the end
of the search path:
beginning: for units that need to override all configuration, regardless
of user or vendor. Example use: system-update-generator uses this to
temporarily redirect default.target.
middle: for units that need to override vendor configuration, but not
vendor configuration. Example use: /etc/fstab should override vendor
supplied configuration (think /tmp), but should not override native user
configuration.
end: does not override anything but is available as well. Possible usage
might be to convert D-Bus bus service files to native units but allowing
vendor supplied native units to win.
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deadlocks
This makes all generators log to kmsg by default.
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